Public bug reported: In OVN driver, traffic from vlan (or any other) tenant network to external network uses a geneve tunnel between the compute node and the gateway node. So MTU for the VLAN networks needs to account for geneve tunnel overhead.
This doc [1] explains about OVN vlan networks and current issue and future enhancements. There is ovs-discuss mailing list thread [2] discussing the surprising geneve tunnel usage. [1] https://docs.google.com/document/d/1JecGIXPH0RAqfGvD0nmtBdEU1zflHACp8WSRnKCFSgg/edit#heading=h.st3xgs77kfx4 [2] https://mail.openvswitch.org/pipermail/ovs-discuss/2018-April/046543.html ** Affects: neutron Importance: Undecided Assignee: venkata anil (anil-venkata) Status: New ** Changed in: neutron Assignee: (unassigned) => venkata anil (anil-venkata) -- You received this bug notification because you are a member of Yahoo! Engineering Team, which is subscribed to neutron. https://bugs.launchpad.net/bugs/1765691 Title: OVN vlan networks use geneve tunneling for SNAT traffic Status in neutron: New Bug description: In OVN driver, traffic from vlan (or any other) tenant network to external network uses a geneve tunnel between the compute node and the gateway node. So MTU for the VLAN networks needs to account for geneve tunnel overhead. This doc [1] explains about OVN vlan networks and current issue and future enhancements. There is ovs-discuss mailing list thread [2] discussing the surprising geneve tunnel usage. [1] https://docs.google.com/document/d/1JecGIXPH0RAqfGvD0nmtBdEU1zflHACp8WSRnKCFSgg/edit#heading=h.st3xgs77kfx4 [2] https://mail.openvswitch.org/pipermail/ovs-discuss/2018-April/046543.html To manage notifications about this bug go to: https://bugs.launchpad.net/neutron/+bug/1765691/+subscriptions -- Mailing list: https://launchpad.net/~yahoo-eng-team Post to : yahoo-eng-team@lists.launchpad.net Unsubscribe : https://launchpad.net/~yahoo-eng-team More help : https://help.launchpad.net/ListHelp
